I know what you mean. My clutch fluid used to be the original fluid that came with the car 12 years and 220k miles ago .I didn't know to replace in pair but I got the master on order and should be here tuesday! Well atleast my lines will be all sorts of clean when im done. The fluid was jet black And gives me another chance to lube up that pivot point some more now that you mention it
You're going to pull the transmission? You may want to look into new parts if so. Clutch/flywheel/pressure plate, rear main seal, throw out bearing, and possibly clutch fork (if it looks severely worn) to name a few.